beta Dielectric relaxation mode in side-chain liquid crystalline polymer film

Abstract

In this paper, side-chain liquid crystalline polymer (SLCP) film was studied by dielectric relaxation spectroscopy (DRS). Dielectric properties were measured in the frequency range from 1 kHz to 10 MHz at some fixed temperatures. The experimental data were fit non-Debye type Cole-Cole dielectric relaxation function. A single dielectric relaxation mode was observed in polymer film. It is observed that relaxation characteristics show Arrhenius type behavior. Activation energy value obtained from the relaxation data was found to be 0.1 eV. The relaxation process is interpreted in terms of side-chain dipole group motion (beta relaxation). (C) 2007 Elsevier B.V. All rights reserved.